Datasheet

5Maxim Integrated
DS2465
DeepCover Secure Authenticator with
SHA-256 Coprocessor and 1-Wire Master Function
ABRIDGED DATA SHEET
Detailed Description
The DS2465 is a SHA-256 coprocessor with built-in
1-Wire master and two pages of user memory.
Refer to the full data sheet for this information.
The self-timed 1-Wire master function supports advanced
1-Wire waveform features including standard and over-
drive speeds, active pullup, and strong pullup for power
delivery. The active pullup affects rising edges on the
1-Wire side. The strong pullup function uses the same
pullup transistor as the active pullup, but with a differ-
ent control algorithm. Once supplied with command
and data, the input/output controller of the DS2465 per-
forms time-critical 1-Wire communication functions such
as reset/presence-detect cycle, read-byte, write-byte,
single-bit R/W, and triplet for ROM Search, without requir-
ing interaction with the host processor. The host obtains
feedback (completion of a 1-Wire function, presence
pulse, 1-Wire short, and search direction taken) through
the 1-Wire Master Status register and data through the
1-Wire Read Data register. All registers, the user memory
and a scratchpad are located in a linear address space
for direct access. The DS2465 communicates with a host
processor through its I
2
C bus interface in standard mode
or in fast mode. See Figure 1 for a block diagram.
Pin Configuration
Pin Description
PIN NAME FUNCTION
1 GND Ground Reference
2 IO I/O Driver for 1-Wire Line
3 V
CC
Power-Supply Input
4 SLPZ
Active-Low Control Input. Activates the
low-power sleep mode and issues a
device reset of the SHA-coprocessor and
the 1-Wire master (equivalent to the
1-Wire Master Reset command).
5 SDA
I
2
C Serial-Data Input/Output. Must be
connected to V
CC
through a pullup
resistor.
6 SCL
I
2
C Serial-Clock Input. Must be connect-
ed to V
CC
through a pullup resistor.
V
CC
IO
GND
SLPZ
SCL
SDA
TSOC
TOP VIEW
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5
4
6
2
3
1
DS2465